Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (48): 8984-8987.doi: 10.3969/j.issn.1673-8225.2010.48.014

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Biomechanical evaluation of different fixation methods using screws and less invasive stabilization system-distal femur plate at proximal fracture 

Zhang Yan1, Yang Tie-yi1, Ji Hai-long1, Liu Yue1, Wang Zhi 1, Jiang Rui1, Fan Xin-bin1, Ye Wei-guang1, Huang Guo-hua1, Liu Shu-yi1, Ding Zu-quan2   

  1. 1 Department of Orthopaedics, Gongli Hospital, Pudong New Area, Shanghai  200135, China; 2 S chool of Life Science and Technology, Tongji University, Shanghai  200092, China
  • Online:2010-11-26 Published:2010-11-26
  • Contact: Yang Tie-yi, Chief physician, Department of Orthopaedics, Gongli Hospital, Pudong New Area, Shanghai 200135, China Yang.tieyi@yahoo.com.cn
  • About author:Zhang Yan☆, Doctor, Associate chief physician, Department of Orthopaedics, Gongli Hospital, Pudong New Area, Shanghai 200135, China rmyyzh@126.com
  • Supported by:

     a grant from Shanghai Pudong New Area, No. PW: 2007A-11*

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Abstract:

BACKGROUND: In recent years, Less Invasive Stabilization System-distal femur (LISS-DF) plate has been widely used clinically, and proximal screw loosening and withdrawal are observed during follow-up. However, it remains unclear whether there is correlation between this phenomenon and unilateral cortical fixation of proximal screw.
OBJECTIVE: To explore the biomechanical effect of LISS-DF by screw fixation with different unilateral or bilateral cortical in proximal distal femoral fracture.
METHODS: Of 185 fresh sheep femora, the distal femoral fracture model of AO33-A3 was made. Five-hole LISS-DF plate was used in combination with screws through the fracture of the proximal cortex of unilateral or bilateral cortical fixed. Pulling and torsion tests were performed to identify ideal fixation way.  
RESULTS AND CONCLUSION: Fracture distal and proximal screws were used for 4-hole conventional fixation. Pull out experiment showed that there was no significant difference in fracture strength values at both ends of the resistance to pull out in the first 1 and 3 hole fracture of the proximal screws double cortex, 2, 4 and 1, 4 bilateral cortical fixation (P > 0.05). Torsion experiment showed that when the holes of 1 and 3, 2 and 4 and 1 and 4 were fixed, the anti-torque values were similar, and no differences were observed between 1-3 and 2-4 holes (P > 0.05), but differences were observed among other groups (P < 0.05). Results show that when using the same specification LISS-DF plate in the treatment of distal femoral fractures, the 1, 3 holes or 2, 4 holes bilateral cortical fixation displayed good fixation strength of the balance between plate and screw, and better resistance against torsion and pulling out compared with other fixation methods.

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